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Here is an antique Secondary Mirror assembly for a Newtonian Reflecting Telescope with a 3-arm spider.
I am afraid this is quite outside my sphere of knowledge, but I can at least describe the polished brass main housing and adjustment screws, polished steel spider arms or vanes and plates at the outer ends. I cannot say that this is complete or would work given a decent mirror glass, but it does appear all there to my untrained eye.
The glass section is quite chipped on the bottom edge and marked on one face and there is no silvering – the minor axis measures 32mm approx. The radius of the spider to the threaded section tip is 12cm approx.
I always pack items safely for posting and am happy to combine postage where advantageous to the buyer.
If you have any queries please feel free to contact me.
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Category: Cameras and Photography:Telescopes and Binoculars:Telescope Parts and Accessories:Other Telescope Parts
Location: Cambridge, Cambridgeshire